11-871 25.4 mm Dia. Germanium Protective Flat Window; t=3 mm BBAR 8-12µm

This 11-871 optical window, sourced from Edmund Optics, is a high-quality, flat window designed for protective applications. It boasts a generous 25.4 mm diameter, providing a substantial aperture for a wide range of optical systems. The window is constructed with a thickness of 3 mm, offering a robust and durable solution for your optical needs.

The window is made from Germanium burnett, a material known for its excellent transmission properties in the infrared region of the spectrum. Specifically, this window is designed for use with wavelengths of 10600 nm, making it an ideal choice for infrared applications.

The window features a broadband anti-reflection (BBAR) coating on both the front and back surfaces. This coating, identified as edm arcedgermanium81, is specifically designed to reduce reflection and increase transmission across the 8-12 µm wavelength range. This makes the window particularly suitable for use in high-transmission applications where minimal reflection is critical.

The window is shaped as a thin lens, which can be beneficial in certain optical configurations. However, it's important to note that this window does not have any focusing or dispersive properties. Instead, it primarily serves to protect optical elements and surfaces from environmental contaminants and damage.